The greatest diversity of animals is found in the
A. tropical rainforest.
B. boreal coniferous forest.
C. tundra.
D. temperate deciduous forest.
A. tropical rainforest.
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One possible reason that there are not any really large insects currently living on Earth is that
A. gas exchange across their moist skin surfaces cannot support the metabolic needs of a large body. B. they do not have as many papulae as echinoderms. C. their gills do not have as many lamellae as fish gills. D. the bulk flow of air through their tracheal tubes would be more difficult the larger the body and longer the tracheal tubes. E. their lungs never evolved to be as highly branched as a mammal's. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about respiration in insects? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
You mate two pea plants that are both AaBb and get a 3:1 phenotype ratio. This suggests
A. crossing-over occurred. B. independent assortment occurred. C. genes A and B are on different chromosomes. D. nondisjunction occurred. E. genes A and B are linked on the same chromosome.
Darwin studied and wrote extensively about the mechanism known as artificial selection. Artificial selection is similar to natural selection, except that ________
A) natural selection works toward a specific goal B) artificial selection relies on preexisting variations in populations; natural selection does not C) artificial selection produces varieties that would be less likely be favored in nature D) artificial selection produces varieties of less interest to humans than natural selection
If you traveled back in time and met a living hominin, which clues might tell you that your new friend was in the genus Australopithecus and not Homo?
A) The hominin was bipedal. B) You were in Africa. C) The hominin had a relatively large brain. D) You had traveled 3.5 million years into the past.